T.W.
Don't worry, he won't start kindergarten in diapers. He'll go when he's ready. I have a 3 year, 2 month old who has been "potty trained" for about a month. He just decided one day (after trying everything you can think of including some things I'm not very proud of) to use the potty and has only had about 25 accidents since :)~. Hang in there. He'll get the hang of it sooner or later.
PS...back off a little. Let him be in control. My peditrician told us that feeding and pottying should never be a battle. He asked my son at his 3 year old visit if he liked using the potty. My son said no. The dr told him that we sure would be proud when he decided to use it all the time. He was potty trained in days. I made it a point to take him back to the dr to report his progress so the dr could compliment him.